I don't like bands with dudes that are married they run around shows scamming on girls. Being a father and a husband and playing in a touring band it really pissed me off when we played those few shoes with them

Another member of the biggest police force in the world: the self-appointed morality police. You should probably try and figure out why this bothers you so much. It really should only bother those directly affected/involved.

Yeah, I generally separate the art from the artist as well. Infidelity is not necessarily a deal breaker on a band. But those considerations aside, you can drive an armored division thru his logic. I might not be directly affected by someone's murder but I think murdering someone is rather immoral. Sounds like he's getting the thought police confused with morality. Now, someone's infidelity may not be any of my business, but it's still a shitty thing to do.

No, murder is not a fair parallel to infidelity. One is a crime and deprives someone of life. The other does not. The other isn't even a crime. There's a huge difference. If someone is cheating on someone else, the person being cheated on (along with a few peripheral people like their kids) are affected and have an investment in what happened. No one else does. We're conditioned to think we need to judge or intervene, when really it's none of our business or concern. Murder, on the other hand, is a crime and has been defined as a crime against society.

that's definitely a fair point. I think it depends. It's one thing if you accidentally spot your married co-worker out with a date at the dairy queen. If someone is brazenly flaunting infidelity and counting on you to follow some kind of code I think it's at least ok to have a reaction.

I'm not drawing a parallel, most people know murder is more immoral than infidelity. Kinda banking on that. Rather I'm extending your line of reasoning so I can demonstrate the poor construction of the argument's form. To do that, I differentiated between murder and infidelity in order to show that because your argument actually holds for the most extreme cases as well, it's completely absurd. Did I not say, "Now, someone's infidelity may not be any of my business, but it's still a shitty thing to do." ? The point being that just because something is less immoral than something else doesn't make the lesser one suddenly more moral which is really what you're trying to say. "We're conditioned to think we need to judge or intervene, when really it's none of our business or concern.".This is just the same sophistry. Whether or not one chooses to intervene has nothing to do with whether or not the act is immoral. Witnesses to a heinous crime who refuse to testify don't make the crime any less immoral. If I choose to mind my own business in regards to someone's infidelity that doesn't make the cheating any less dishonest.